<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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    <title>Document</title>
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    <style>
        div{
            border: 1px solid black;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-md-4 col-md-push-8">左侧</div>
        <div class="col-md-8 col-md-pull-4">右侧</div>
    </div>
</div>
</body>
</html>